The process in which biomass is converted into biogas also occurs in nature, take marshlands for instance. However, the organic material for the ReFood biogas plants is comprised entirely of food waste.
How does this process work? Compare it with placing a pan of split pea soup in the sun - after a period of time it will start to ferment. The gases will escape (these are then captured and converted into energy and heat) after which a concentrated composition remains. This composition is, of course, entirely hygienised (free from animal bacteria that are harmful to human health) and can be used directly in agriculture.